Radio Road

RE: Marantz 10 B Optocouplers.

128.48.7.72

In Reply to: RE: Marantz 10 B Optocouplers. posted by tesla on May 05, 2008 at 12:16:09

Hi, Gene:

AFAIK, there is nothing published, specification-wise, on the LDRs used in the 10-B.

At least, I am unaware of it in the existing literature.

VacTec, Inc., once manufactured a part which worked, but that was quite a long time ago. The parts were called "Vactrols", a trademarked designation, apparently.

In the meanwhile, either try to determine the "dark" Vs. "lit" resistance of a working one and see if the unit uses either an NE-1 or NE-2 lamp. Obviously, you need to remove, cut open and inspect an LDR module to do this sort of thing.

The parts cost practically nothing if you can find them.

You simply have to experiment a bit with the CdS cell sensitivity issue.

If you are unable to do this, or unwilling to remove and open an original one, just see if you can purchase some of the units being offered on occasion over on eBay and pay $100 or more.

I included one seller on eBay who has offered his own home-brew versions in the past.

I have no connection with that seller at all and cannot vouch for what he is offering.

It's your choice, but good luck!

Here is an unusual page full of data on optocouplers, in case you want to read up on the subject:

http://72.14.253.104/search?q=cache:ljWJGefB5hsJ:www.doepfer.de/a100_man/Vactrol.htm+vactrol+and+incandescent+ldr&hl=en&ct=clnk&cd=2&gl=us

Richard Links
Berkeley, CA

Optocouplers for Marantz 10-B Tuner (Open in New Window)

Follow Ups:

I have installed the optocouplers offered by sq38s on my 10B... - crooner 17:45:07 05/05/08 (8)
- RE: I have installed the optocouplers offered by sq38s on my 10B... - Marantzguy 11:16:08 05/06/08 (1)
  - LOL, you are right! - crooner 15:04:57 05/06/08 (0)
- Here's a "before" pic with the original optocouplers in place... - crooner 17:49:53 05/05/08 (5)
  - Here's the "after" pic with the eBay optocouplers in place... - crooner 17:51:32 05/05/08 (4)
    - RE: Here's a pic of what's in the optocoupler - Steve O 20:51:33 05/08/08 (3)
      - thanks for posting! - crooner 16:39:51 05/09/08 (0)
      - RE: Here's a pic of what's in the optocoupler - Marantzguy 11:03:38 05/09/08 (1)
        
        Interesting post as usual Rich! - crooner 16:44:33 05/09/08 (0)

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